The fast of the month of Av (Tisha B'Av) https://en.wikipedia.org/wiki/Tisha_B%27Av takes place this year beginning Saturday at sundown. In particular, look near the bottom of the Wiki article to see the other events in history that have taken place on or near this date.

The life, death, and resurrection of Yeshua offers us another level or reality (not readily available to the non-Yeshua believing Jewish world) for understanding and celebrating every feast/fast day on the Jewish calendar. This is true on Tisha B’Av as well. While the larger Jewish world is mourning the loss of Temple worship and the Aaronic priesthood, Messianic Judaism takes great comfort in the greater priesthood of Melchizedek. Consider these verses ...

Hebrews 9:23-28 "Therefore it was necessary for the replicas of these heavenly things to be purified with these sacrifices—but the heavenly things themselves with better sacrifices than these. For Messiah did not enter into Holies made with hands - counterparts of the true things - but into heaven itself, now to appear in God's presence on our behalf ... But as it is, He has been revealed once and for all at the close of the ages—to put away sin by the sacrifice of Himself. And just as it is appointed for men to die once, and after this judgment, so also Messiah, was offered once to bear the sins of many. He will appear a second time, apart from sin, to those eagerly awaiting Him for salvation."

We have hope. Not hope for the return of Temple worship, but hope that the whole world will receive the greater sacrifice of our High Priest, Himself, Yeshua HaMashiach. Shalom.